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  • Crossover simulation

    Possible to simulate a crossover for a Peerless 850122 woofer and XT-25 tweeter? I don't have the means to do so. I did find this one on-line, but I'd feel more confident in a design produced by the experts on this forum. Baffle size would be approximately 9" x 18.5" with 3/4" round overs.

    Peerless 850122 parameters:

    https://www.parts-express.com/pedocs...ions-44346.pdf

    Peerless XT25 parameters:

    https://www.parts-express.com/pedocs...spec-sheet.pdf


  • #2
    I have a two way I'm running at the moment with the 850122 but with a Seas 27TDFC tweeter. Pretty impressed with the sound from the "cheap" CSX woofer. My baffle dimensions are very similar to yours. If you can provide the XT25 FRD/ZMA files - I could apply that for you and come up with a sim. Or upload the data here for you to play with

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    • #3
      PS: Your woofer crossover looks a bit complicated and unless you are playing these nearfield / in a wall / bookshelf - it doesn't look like you have any baffle step compensation. Mine have 4 - 5dB bafflestep and the overall system design ends up being about 84dB efficient. My 850122s are ported and played away from the back wall in a bigger room. Any less BSC and they sound a bit thin to me.

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      • #4
        Dave- Disregard my previous post. I had a devil of a time finding the FRD and ZMA, but I think this link has them.

        http://www.audiodevelopers.com/Refer...%2Fraw_xt25%2F
        Last edited by B King; 03-11-2019, 03:26 PM. Reason: misspelling

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        • #5
          I agree w/Dave, I see no apparent BSC, and the parts count seems high.

          Here Dave: (just traced, NO phase) - no box model (below 300Hz) but looks like a killer bass contender, vented
          297-632.FRD
          297-632.ZMA

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          • #6
            Chris, yours and Dave's observations are exactly why I posted here. I knew the experts on this forum would be able to guide me in the right direction.

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            • #7
              Are they going to be used on stands out away from the wall a few feet or so? Sealed? Ported? Used with a sub? How loud, and what type of music?

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              • #8
                They'll be on stands ported. I like my music louder than most, but I don't try to get a 20Hz tone at 90dB, from a 6"woofer.

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                • #9
                  Originally posted by B King View Post
                  They'll be on stands ported. I like my music louder than most, but I don't try to get a 20Hz tone at 90dB, from a 6"woofer.
                  How close to the walls?

                  The woofer response looks very similar to some Peerless HDS drivers I've used. They can cross in the 2k to 2.5k range, and sound good. Crossing at 2,5k, or maybe even 3k allows you to play louder.

                  Can you measure the response?

                  Here's a woofer filter that is probably in the ballpark for a 2k x-over.
                  http://techtalk.parts-express.com/fi...hotoid=1398275

                  This is my measurement with the filter.
                  http://techtalk.parts-express.com/fi...7&d=1545664768

                  My driver. https://www.parts-express.com/pedocs...spec-sheet.pdf

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                  • #10
                    That is a different woofer from the 850122 I'm using. I haven't compared specs so I don't know how different.

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                    • #11
                      Originally posted by B King View Post
                      That is a different woofer from the 850122 I'm using. I haven't compared specs so I don't know how different.
                      I know it's different, but the responses are pretty close. The impedance is a little different up high. I suspect that the filter would be close, and could be tweaked by changing the 3mH coil to other values. That's why I asked if you can measure. Should have also asked if you have parts on hand.

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                      • #12
                        I don't have the tweeters yet. They're on order. But I have a box of caps and inductors that are very likely to contain the right parts. Yours will be a good starting point.

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                        • #13
                          Originally posted by B King View Post
                          I don't have the tweeters yet. They're on order. But I have a box of caps and inductors that are very likely to contain the right parts. Yours will be a good starting point.
                          Can you measure?

                          My baffle is 9" x 17.3". No round-overs. Woofer center-line is about 5.5" from bottom edge. It looks a little odd because the tweeter is a long ways from the top, and offset. Measures, and sounds fine though.

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                          • #14
                            Unfortunately, no.

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                            • #15
                              Originally posted by Chris Roemer View Post
                              I agree w/Dave, I see no apparent BSC, and the parts count seems high.

                              Here Dave: (just traced, NO phase) - no box model (below 300Hz) but looks like a killer bass contender, vented
                              [ATTACH]n1406232[/ATTACH]
                              [ATTACH]n1406233[/ATTACH]
                              Thanks Chris - assuming IEC - I'll subtract that (some don't bother, but do it anyway) and apply a BDS sim and take a look

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